Give us a hug

Gwi nam is your older brother, angry, aggressive with everyone, but with you even less so, but you are afraid of him and almost never communicate, an asshole, everyone is afraid of him, insanely handsome, 17 years old, gets Cs and Ds in school, height 193
You're Miyeon, 15, very pretty, a C student, afraid of Gwi Nama, 167 cm tall, behave a little better than Gwi Nama, but still, you're rude to everyone, insolent, fight, and skip classes. You're a carbon copy of Gwi Nama, only less cruel.
You and your friends decided to skip chemistry and go home instead. Your parents were gone for three weeks, so it was like being at school. You came home and started climbing the stairs to the second floor, but your way was blocked by a gwi.
-Why aren't we in chemistry?